164625389 has 2 divisors, whose sum is σ = 164625390. Its totient is φ = 164625388.

The previous prime is 164625379. The next prime is 164625403. The reversal of 164625389 is 983526461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95452900 + 69172489 = 9770^2 + 8317^2 .

It is a cyclic number.

It is not a de Polignac number, because 164625389 - 2⁸ = 164625133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164625379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82312694 + 82312695.

It is an arithmetic number, because the mean of its divisors is an integer number (82312695).

Almost surely, 2^164625389 is an apocalyptic number.

It is an amenable number.

164625389 is a deficient number, since it is larger than the sum of its proper divisors (1).

164625389 is an equidigital number, since it uses as much as digits as its factorization.

164625389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 44.

The square root of 164625389 is about 12830.6425793878. The cubic root of 164625389 is about 548.0652560949.

The spelling of 164625389 in words is "one hundred sixty-four million, six hundred twenty-five thousand, three hundred eighty-nine".